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US-12621199-B2 - Techniques for generating waveforms for full duplex wireless communications

US12621199B2US 12621199 B2US12621199 B2US 12621199B2US-12621199-B2

Abstract

Aspects described herein relate to modifying data for input to a discrete Fourier transform (DFT) so a set of resource elements (REs) output from the DFT for transmission in a communication direction includes one or more punctured REs corresponding to reference signals received in a different communication direction, performing the DFT for the data to generate the set of REs, mapping at least a portion of the set of REs to one or more symbols to generate a signal, and transmitting the signal in the communication direction. Other aspects relate to receiving the signal and decoding the data.

Inventors

  • Ahmed Elshafie
  • Muhammad Sayed Khairy Abdelghaffar
  • Ahmed Attia ABOTABL
  • Abdelrahman Mohamed Ahmed Mohamed IBRAHIM

Assignees

  • QUALCOMM INCORPORATED

Dates

Publication Date
20260505
Application Date
20221129

Claims (20)

  1. 1 . An apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: modify data for input to a discrete Fourier transform (DFT) so a set of resource elements (REs) output from the DFT for transmission in a communication direction includes one or more punctured REs corresponding to reference signals received, by the apparatus and from another device, in a different communication direction; perform the DFT for the data to generate the set of REs; map at least a portion of the set of REs to one or more symbols to generate a signal; and transmit the signal in the communication direction.
  2. 2 . The apparatus of claim 1 , wherein the instructions, when executed by the processor, cause the apparatus to receive, while transmitting the signal in the communication direction, the reference signals in the different communication direction.
  3. 3 . The apparatus of claim 2 , wherein the reference signals include a demodulation reference signal (DMRS) received from a second device, and wherein the instructions, when executed by the processor, cause the apparatus to perform, based on the DMRS, channel estimation of a channel received from the second device in non-punctured REs.
  4. 4 . The apparatus of claim 1 , wherein the instructions, when executed by the processor, cause the apparatus to modify the data at least in part by reducing a size of the data to be less than a size indicated for input to the DFT.
  5. 5 . The apparatus of claim 1 , wherein the instructions, when executed by the processor, cause the apparatus to modify the data at least in part by padding a number of zeros between samples as the input to the DFT to generate the one or more punctured REs, and wherein the instructions, when executed by the processor, cause the apparatus to map at least the portion of the set of REs at least in part by mapping a number of REs equal to a size of the input to the DFT divided by the number of zeros.
  6. 6 . The apparatus of claim 5 , wherein the instructions, when executed by the processor, cause the apparatus to map the number of REs at least in part by mapping multiple repetitions of the number of REs to the one or more symbols to generate the signal.
  7. 7 . The apparatus of claim 1 , wherein the instructions, when executed by the processor, cause the apparatus to modify the data at least in part by reducing a size of the data to be a size indicated for input to the DFT divided by a number of the one or more punctured REs, and wherein the instructions, when executed by the processor, cause the apparatus to perform the DFT at least in part by inputting multiple repetitions of the data of the reduced size to the DFT.
  8. 8 . The apparatus of claim 1 , wherein the instructions, when executed by the processor, cause the apparatus to reduce an input size of the DFT based on a number of the one or more punctured REs, and wherein the instructions, when executed by the processor, cause the apparatus to modify the data at least in part by reducing a size of the data to be the input size of the DFT as reduced.
  9. 9 . The apparatus of claim 1 , wherein the instructions, when executed by the processor, cause the apparatus to modify the data at least in part by reducing a size of the data based on a number of the one or more punctured REs, and padding a second number of zeros to an end of the data, wherein the second number is equal to the number of the one or more punctured REs, and wherein the instructions, when executed by the processor, cause the apparatus to map at least the portion of the set of the set of REs at least in part by mapping a number of REs equal to a size of the input to the DFT divided by the second number.
  10. 10 . The apparatus of claim 1 , wherein the apparatus is one of a user equipment or a gNB that uses DFT-spread-orthogonal frequency division waveform to generate signals.
  11. 11 . An apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: receive a signal from a first device in a communication direction; demap at least a portion of a set of resource elements (REs) from the signal, wherein the set of REs include one or more punctured REs corresponding to reference signals transmitted by a different device than the first device in a different communication direction; and perform an inverse discrete Fourier transform (IDFT) on at least the portion of the set of REs to generate data.
  12. 12 . The apparatus of claim 11 , wherein the instructions, when executed by the processor, cause the apparatus to transmit, while receiving the signal in the communication direction, the reference signals in the different communication direction.
  13. 13 . The apparatus of claim 12 , wherein the reference signals include a demodulation reference signal (DMRS) corresponding to a channel transmitted in non-punctured REs.
  14. 14 . The apparatus of claim 11 , wherein the data is of a reduced size that is less than an output size of the IDFT.
  15. 15 . The apparatus of claim 11 , wherein the data includes a number of padded zeros between samples equal to a number of the one or more punctured REs, and wherein the instructions, when executed by the processor, cause the apparatus to demap at least the portion of the set of the set of REs at least in part by demapping a number of RES equal to a size of an output of the IDFT divided by the number of zeros.
  16. 16 . The apparatus of claim 15 , wherein the instructions, when executed by the processor, cause the apparatus to demap the number of REs at least in part by demapping multiple repetitions of the number of REs.
  17. 17 . The apparatus of claim 11 , wherein the data is of a reduced size equal to an output size of the IDFT divided by a number of the one or more punctured REs, and wherein the instructions, when executed by the processor, cause the apparatus to perform the IDFT at least in part by outputting multiple repetitions of the data of the reduced size.
  18. 18 . The apparatus of claim 11 , wherein the instructions, when executed by the processor, cause the apparatus to reduce an output size of the IDFT based on a number of the one or more punctured REs, and wherein the data is of a reduced size equal to the output size of the IDFT as reduced.
  19. 19 . The apparatus of claim 11 , wherein the data is of a reduced size that is based on a number of the one or more punctured REs, including a second number of padded zeros at an end of the data, wherein the second number is equal to the number of the one or more punctured REs, and wherein the instructions, when executed by the processor, cause the apparatus to demap at least the portion of the set of the set of REs at least in part by demapping a number of REs equal to a size of an output of the IDFT divided by the second number.
  20. 20 . The apparatus of claim 11 , wherein the apparatus is one of a user equipment or a gNB that uses DFT-spread-orthogonal frequency division waveform to process signals.

Description

FIELD OF THE DISCLOSURE Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to techniques for full duplex (FD) wireless communications. DESCRIPTION OF RELATED ART Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include code-division multiple access (CDMA) systems, time-division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, and orthogonal frequency-division multiple access (OFDMA) systems, and single-carrier frequency division multiple access (SC-FDMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. For example, a fifth generation (5G) wireless communications technology (which can be referred to as 5G new radio (5G NR)) is envisaged to expand and support diverse usage scenarios and applications with respect to current mobile network generations. In an aspect, 5G communications technology can include: enhanced mobile broadband addressing human-centric use cases for access to multimedia content, services and data; ultra-reliable-low latency communications (URLLC) with certain specifications for latency and reliability; and massive machine type communications, which can allow a very large number of connected devices and transmission of a relatively low volume of non-delay-sensitive information. In some wireless communication technologies, such as 5G NR, devices and/or node can use full-duplex (FD) operations to transmit and receive signals in a same time period, where the FD operations may be inter-subband where transmission and reception can occur in different subbands, or intra-subband where transmission and reception can occur in the same subband (or full frequency band). SUMMARY The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. According to an aspect, an apparatus for wireless communication is provided that includes a processor, memory coupled with the processor, and instructions stored in the memory. The instructions are operable, when executed by the processor, to cause the apparatus to modify data for input to a discrete Fourier transform (DFT) so a set of resource elements (REs) output from the DFT for transmission in a communication direction includes one or more punctured REs corresponding to reference signals received in a different communication direction, perform the DFT for the data to generate the set of RES, map at least a portion of the set of REs to one or more symbols to generate a signal, and transmit the signal in the communication direction. According to an aspect, an apparatus for wireless communication is provided that includes a processor, memory coupled with the processor, and instructions stored in the memory. The instructions are operable, when executed by the processor, to cause the apparatus to receive a signal in a communication direction, demap at least a portion of a set of REs from the signal, wherein the set of REs include one or more punctured REs corresponding to reference signals transmitted in a different communication direction, and perform an IDFT on at least the portion of the set of REs to generate data. In another aspect, a method for wireless communication by a full duplex device is provided that includes modifying data for input to a DFT so a set of REs output from the DFT for transmission in a communication direction includes one or more punctured REs corresponding to reference signals received in a different communication direction, performing the DFT for the data to generate the set of REs, mapping at least a portion of the set of REs to one or more symbols to generate a signal, and transmitting the signal in the communication direction. In another aspect, a method for wireless communication by a full duplex device is provided that includes receiving a signal in a communication direction, demapping at least a portion of a set of REs from the signal, wherein the set of REs include one or more punctured REs corresponding to reference signals transmitted in a different communication direction, and performing an IDFT on at lea